Barbecue oven



FIG. 1 is a front elevational view of a barbecue oven showing my new design;

FIG. 2 is a left side view thereof;

FIG. 3 is a right side view thereof;

FIG. 4 is a top plan view thereof;

FIG. 5 is a first perspective view thereof;

FIG. 6 is a second perspective view thereof; and,

FIG. 7 is a third perspective view thereof.

Portions of the barbecue oven shown in broken lines form no part of the claimed design. 

CLAIM The ornamental design for a barbecue oven, as shown and described. 